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Honors Geometry Section 4.5 (1) Parallelograms. A parallelogram is a quadrilateral with both pairs of opposite sides parallel. To name the parallelogram to the right, we use the notation. You will need to know the following properties of parallelograms.
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A parallelogram is a quadrilateral with both pairs of opposite sides parallel.
You will need to know the following properties of parallelograms.
Theorem 4.5.2In a parallelogram, opposite sides are congruent
Theorem 4.5.3In a parallelogram, opposite angles are congruent
Theorem 4.5.4In a parallelogram, consecutive angles are supplementary.
Theorem 4.5.5In a parallelogram, the diagonals bisect each other.